Journal
DYES AND PIGMENTS
Volume 139, Issue -, Pages 627-634Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.12.065
Keywords
Organic solar cell; Fused-ring electron acceptor; Nonfullerene; Side chain engineering; Indacenodithiophene
Funding
- 973 Program [2013CB834702]
- NSFC [91433114, 21504006, 21534003]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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A series of fused-ring electron acceptors with indacenodithiophene as core, 2-(3-oxo-2,3-dihydroinden-1 -ylidene) malononitrile as end groups, thiophene with different side chains as pi bridge are designed, synthesized and applied in non-fullerene organic solar cells (OSCs). The effects of alkyl side chains on absorption, energy level, molecular packing, domain size, domain purity, charge transport and photovoltaic performance are systematically investigated. Via the steric hindrance effect, increase in carbon number of side chains slightly downshifts HOMO energy levels, upshifts LUMO energy levels and thereby increases open circuit voltage from 0.84 to 0.95 V gradually. Short circuit current, fill factor and efficiency vary non-monotonically with aliphatic carbon number of alkyl chains and reach maximum value simultaneously when carbon number is six. (C) 2016 Elsevier Ltd. All rights reserved.
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